Add noCleanup argument (#95)

* Added noCleanup argument (don't delete temp audio/video files on ffmpeg error)
* Added argument to README

Co-authored-by: Aleksa Savic <savicaleksa83@gmail.com>

src/CommandLineParser.ts

@@ -54,6 +54,13 @@ export const argv = yargs.options({
         type: 'boolean',
         default: false,
         demandOption: false
+    },
+    noCleanup: {
+        alias: 'nc',
+        describe: `Don't delete the downloaded video file when an FFmpeg error occurs`,
+        type: 'boolean',
+        default: false,
+        demandOption: false
     }
 })
 /**